Does a built motor require a tune?
 

I was thinking about upgrading my rods valve springs and pistons and was wondering if i would need to get a tune right after? Im trying to get forged pistons with a cr of 10:1 and was wondering if I need a tune if im lowering the cr. I also have a turbo kit I'm going to install after installing the rods and pistons and valve springs. But if i don't require a tune for just the rods, pistons and valve springs than I wouldn't mind driving the car around with just a built motor in order to break everything in.
Thanks

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You are changing basically characteristics of your engine like pistons and compression ratio. You definitely need a tune, since the existing tune will not be optimal. Why don't you install the turbo kit together?

I didn't want to install the turbo kit because i wanted to break in the built motor first. But my tuner told me that the power goals im aiming for the stock components can handle. So i might just save my money instead Sent from my LG-H871 using Tapatalk

Christ, a stock motor requires a tune.

Whether you have the turbo on or not, as long as you stay within the break in specs, nothing will go wrong. You drive it without a tune on lowered compression ratio, you will have more to worry about than a break in period.

The stock tune tune will work on a engine rebuild. If you lower the compression it will be safer than stock. The computer will also learn the new engine. If you are getting lots of porting work, changing valves and cams, you should get a tune sooner than later to play it safe...

That being said I would want at least a stage 1 tune and do a good data log to make sure nothing is out of wack. You don't want to burn up a new engine because the stock settings are too far off.

I apologize in advance for reviving an old thread but I just wanted to know if a newly built engine should start after only changing the compression ratio without a new base map. My car has been in the shop getting forged internals for the past couple months and now will not start..

I'm guessing that the engine should start, maybe not run its best with the stock tune.

PS - I'd suggest you make sure the ECU is screwed down tight (grounded).


humfrz

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